A simple and efficient procedure for the debromination of vic-dibromides has been reported with hexamethylphosphoric triamide at 155–160 °C under a nitrogen atmosphere without the aid of any reagent.
据报道,在 155–160 °C 下,在氮气氛下,无需任何试剂的帮助,六甲基磷酰三胺脱溴的简单有效程序。
Visible Light-Mediated Coupling of α-Bromochalcones with Alkenes
作者:Suva Paria、Viktor Kais、Oliver Reiser
DOI:10.1002/adsc.201400638
日期:2014.9.15
Photoredox catalyzed intermolecular couplings of α‐bromochalcones to olefins have been developed. Employing 1 mol% of the iridium complex Ir(ppy)3 as photocatalyst, vinyl radicals are generated from α‐bromochalcones as the key intermediate, which efficiently engage in a formal [4+2] cyclization with various alkenes. The resulting 3,4‐dihydronaphthalenes can be readily transformed to the corresponding
已经开发了光氧化还原催化的α-溴代查耳酮与烯烃的分子间偶联。使用1 mol%的铱络合物Ir(ppy)3作为光催化剂,乙烯基自由基是由α-溴代查耳酮作为关键中间体生成的,可以有效地与各种烯烃进行正式的[4 + 2]环化反应。生成的3,4-二氢萘可以很容易地转化为相应的萘,并进一步环化为5 H-苯并[ c ]芴。另外,如果烯烃在烯丙基位置具有合适的离去基团,则可以得到Heck型偶联产物与空间受阻更强的烯烃或烯丙基化产物。
Chiral N,N′-dioxide-Sc(NTf<sub>2</sub>)<sub>3</sub> complex-catalyzed asymmetric bromoamination of chalones with N-bromosuccinimide as both bromine and amide source
A chiral N,N[prime or minute]-dioxide-Sc(NTf2)3complex catalytic system has been developed to catalyze the asymmetric bromoamination reaction of chalones with N-bromosuccinimide.
Copper-Catalyzed Enantioselective 1,4-Protosilylation of Alkynyl-substituted Enones to Synthesize the Highly Diastereomeric Chiral Homoallenylsilanes
作者:Qi Li、Zi-Lu Wang、Huan-Xuan Lu、Yun-He Xu
DOI:10.1021/acs.orglett.2c00739
日期:2022.4.22
A copper-catalyzed 1,4-protosilylation of α-alkynyl-enones to form the functionalized chiral homoallenylsilanes was developed. In the presence of a chiral monopyridine oxazoline ligand, a variety of trisubstituted allene derivatives bearing a contiguous stereogenic center and axis were prepared in good yields with excellent enantioselectivities and diastereoselectivities.
Phosphine-Mediated Regio- and Stereoselective Hydrocarboxylation of Enynes
作者:Wenbo Li、Junliang Zhang
DOI:10.1021/ol4031556
日期:2014.1.3
A phosphine-mediated regio- and stereoselective addition reaction of diverse nucleophiles to yne-enones leading to polysubstituted 1,3-diene scaffolds in moderate to good yields has been reported.